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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185db418716bd0107ffd52a2e6ae0d8e9c3d266564ad2e061fbee3af20288834' 
  AND token = 'ER4nW4vWqG7SlyvmQKOR30g+Pg22nnrY2llCH0pXVlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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