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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b73b81677305a6cc6005726c1237efd1103e9bd86df9b1e59dd873293f43bb' 
  AND token = 'fvoCZ69HdZ/WZloZ5/XaQ9NBKIm/f7N8PdMnVLJ4GNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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