SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34bda9833e599738663e554a43bc53062fe2f7d7b64abb5052ff9dc47da0e4f' 
  AND token = 'SZZ0vZvhJ2vKdk1Mi2wWVzGr8K0QJ8p9hkYR+4y8qfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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