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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6471e59f08ec245d110fa10d744496539e94f432908e02934b9b4ffcbdcf6e5' 
  AND token = 'logZ7iI92C6M8VJF3ANF8ESmOaBURG98WnZ9JW8ODjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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