SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2641e5d6f83642bb4a1c1ebb29b362558f998c389afa7c07415e58124ef23a04' 
  AND token = 'OdjLKcY7s3COFcQlgA+cI7jIBhi6EVJIvbheOuqvEzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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