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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d58e9f7bd4ba1036229c90501efa1f25c08dbffbf6d2ffc48279b2d05e7057' 
  AND token = 'KfUg7P5zG3kf6fmcVvQ9o7PKliNTwQ2LY+APoDQJn+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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