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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a892e1e6efb69a5b6728d4eef40ca3b571debcd4c665064cd0677bd5d2d38f4' 
  AND token = '7ZAy9ksu8VJUc8WWCk1AZKjeWKVXFdBDpgQNrXcOFRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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