SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f622e2a11330ad7f13ad55d037d0c143ec56e37a0b81deb86b998ef52607520' 
  AND token = 'w9m8hqjDlQzvOYbuwfOCscOD7Mm/Qev4VY6YqkYRguo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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