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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a97bd7d93a9ce8cf9077c30c8fd9dfb1995c75a03374a55078dbb7733a4f326' 
  AND token = 'T6uWk9V2Kl1mguHuSZo67/Hn5O+CxEIkxah+dX6sasM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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