SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e0f1b4d9c21d650da1b443719bbb989f420c3042aa80d8e174b1f0f1b39fdb' 
  AND token = 'BzB90ouFlZtvpleiwsNSX0puau3XmIMEknopgZ37ERM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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