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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42dd77d17c7eef4905e278c35cf4a86c549530a68d55d7deb79e8df0c322a6fb' 
  AND token = 'qF6lHi4gCckQNu4kZniMLT7W0dneFSkTsQZ+OjRX9QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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