SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d97a786b76805cd4f608e85594893c2c54f6d37969115592d2979e2e3862963' 
  AND token = 'KdhVmrVCJFU6dkZTCTAhWzODYjasyD0+aOVSxLqoggE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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