SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1481c955066714c498a53f5a85b8a83ecdd905792cd342f2bc6ccb0fe81d6ae0' 
  AND token = 'aFeXmpTtc7/knbN1wFYaiDBLPKnv4a6qRi97bYg78og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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