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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c503869d11edb467e8fe57b335754f77e952e37462a44fea8acc1a6cbf9dfd' 
  AND token = 'CdKawuXCJavcZpUdj5Vese7W3sX5JXUFQQk2989u3iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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