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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041bbcedd9c9be290ff62c63b1e3ff513f3e1bf67f160d11f6f953c85ce110be' 
  AND token = 'cK9TLflCFJnAaT0XF6oSTBUKfJxpfImudf3XwftVA9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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