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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e95ab05fd2bcd0ed20c6a14d0306662d7265c99b77afba9c357ecfcdfb200f' 
  AND token = 'eNLpjGHNTf0jS3O6Qlp73x2sDizGahcVJbs8Fqbsa8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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