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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a6fd252e5ea11bba76e2c46769b2e469b021adbf9c604badf2419287a4b86e' 
  AND token = 'sUv7DskfNcI+ji8DdOldEtFIGIMykt+Ua0n980xW9BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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