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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e5635cdbca7752e121f9eae52d02857ab97365816b764a3954d9e74f329c29' 
  AND token = '3oxA6Pi1fsZpdEMv401b5gV7inMWicQpXoRSUUobk4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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