SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bd6987fa9d3e40a51ac78bae95160742fe7c1ce08fc0d3a281658283ccd262' 
  AND token = 'QGyDxflHldtfICBGoscsFtvg+Zagnjwjk/SLLUOoa1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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