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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e709e7dd1fd6e5eaead87abd67d7c419d1b0c80a09f319c8f0673533a6c393c6' 
  AND token = '8hcvv7whxrzfeJhFn7s8NIDO4cNDfpcTR4xu6DWxqFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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