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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbd04f7eee0c9be157a751ac964985d9b613ea38766f9d580dbe0fd189bf255' 
  AND token = 'hndGAmsHhU63JFnoUrLK2CFwLDFSq7mLVtS7/oxJDiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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