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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4ab1f5f799968133d12e66ab8d6b58767a29a84c4f579fdf614480e2d79f8f' 
  AND token = 'e/cDS+kfDJAYSK7aG7vWso6wR7TiB5sROgHukgvcr5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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