SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0092f3ac2101a886757e58d3e0c46a27bc4a30650340e70db9084d305982ea' 
  AND token = 'qh1LS3Zn+J+Qw74U6BkquuaPvAQm4+FjiGL0VKm2J6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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