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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70a06dcaf289baee2192de7f86006e79b37ad70a51e879ae1b369a698f4a518' 
  AND token = 'JXgmqLA5QFyY0CATvOfGkiOAdAg6b5qvXEaYr6n1Axg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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