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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ba60d259ac49740351121e7f0b866ec2445522ae6ed872212b05a9855486d4' 
  AND token = '9FtamCU41LDVIaEeHK5wKU/g04aDya8elEIpetwvIXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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