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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a480db1ddd612230e4e023938ac1cabd7c46fee7a8b7cd6978b74a824018c40' 
  AND token = 'SWTbA9BmckFvJyM+0KJo2t7BszCdvWsgCkDJu0g7KWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}