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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a7c365aa0b6597dd759ae5ab91c0ae5b6e931b0a9a6ca69ab50566ac1d7f89' 
  AND token = 'gTbipaP806tyZCgy2yXdDhAmYTu4Pswsi/UlU38AxUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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