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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1563abfe791056302f1398f9d1ee686d8a07fd9bbb17d31e3bd2d4c87658b32b' 
  AND token = 'z737p97j937Vy+9CwurjJYD3tcg+HOabM9Aok4ahjtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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