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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c858e0dac72422ff467314da32082078da34a6150071fed4b3f4f99481e328e9' 
  AND token = 'f9onW+wC0C95Uumc9F8N4hJEcOpSynWzIE4VG7SVzZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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