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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1126be2290d3dd13feba85d9bdca88280ff38fa747fc80989368dfaafedaf019' 
  AND token = 'd4uklvE2ztH3Z0mFCK8KYNC9UdcnkdPIghhk9jfqpkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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