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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ec1649d46df195a885eaa50a81924f2d5eebcab032e052bbf5fae4bba863f2' 
  AND token = '+10iw/Ea3f3Z2KWkmb7KgArgZmnSokQaSSunfnTe+8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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