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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e75bf0c1397dbaaee133d283ba3d814bed330b4a982ce3117da4ad4e8e4a24f' 
  AND token = 'R+WsrwqjCnDzc6IU1ocV5Oge4nNINciHWhGpFXsNEPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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