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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c39f7ba48b36c91e85326abe3e76425080a50d2949acb77d1dfa4f8cc9db99c' 
  AND token = 'ppY03eP89U19oxTHwvUz8Wj5+lX4HR6m0ABM0vQUcO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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