SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5072b1df598027549cfe4958bc284eab45e6ef865026ed54163ea13cdefc19cb' 
  AND token = 'jYy0bROCQrdsKL1d2xZRIU7tKDzvR6tPy3q+w+/wvN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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