SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3417733fe2fc3d8f22c4ef3598179b0accc7e683ae89365464bc0302cc167088' 
  AND token = '2WHa0Bg7/hFSIVZQuUMUWBKS7DYtc6Yqlzsl7sCr62w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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