SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84915abc6173f95b5a63dd88afe82950283179c054fbc333f6562f2f31ddd85' 
  AND token = 'Z7POcGf8GI+SzlFfUiqEpgOF7nDKYOTdVohhPMEWaf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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