SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9913817336e71ca0dfd64653e82e5b2d96f1cce2070c592ed8db127118956f0' 
  AND token = '0uLkF6K1MXuq3FXophvsglge1KGlgEq+imJOhz0o2mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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