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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af43c4fe604f0f412e1e78073b35f1232add2e1e8377d4022fa5431adbb7ddb0' 
  AND token = 'kO5oY6TJqvxHomXp8XTJHC6bfOw4repwtWdKRAo4Cso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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