SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4dc5277fc94590d0532a4129a7e4e9f0d6271ad635db118f0b9b41b47dba86' 
  AND token = 'Qw1LkYw/VhzuCUCiyvV132HkFMc30s+vE5vhP3EUveg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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