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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9390b5ec19f3b5f1235445efda7995e9af7d8fc2db7ffd1cbfcdcac9b5602cc' 
  AND token = 'HBtggSrFIhe52p+o4zTRusfsSdeVm7zyZql7RjJ/Jqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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