SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53130bdeb2490f2fd45fe33ee5072fa31662f1aaaa8a2d1a2b86576e3ec18e7' 
  AND token = '+eHL9wIpb1Xs6LR3G9dM4q/nBnnWJvje0Kvn8zFFshU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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