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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7d41db867a79d7931e1582a56998ab09c6887c45707c34185479e8011c6c21' 
  AND token = 'etBhquMKAIU9GZLn8FIq9ufayGHMyziYOP9b1ZYPP/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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