SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57115e26f86a77bf9b43f5006ca8572eb2ea186c1ce43db2216525079bdbd27' 
  AND token = '0qu9ZHhnVdS9UeGToXRPuJ2U4GyalDUBvHGdspYSQNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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