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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ed115e3a7bc0cc3424492acaada05845be2f271dcb63231c0073e2f0040270' 
  AND token = '0qBjpT96wPa2Er5Wq25St9rd4VOsHmWFD8d6DtpngR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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