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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04016c39039c78cc5d67bbfaaec0a9ac4a44dfebc7dc37c26645b4a60fad05f' 
  AND token = 'XZez8zyjtGjRFkhtjZu44G64MA2V/7jBQxckXAB6fns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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