SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1be3f3ba258eafbf1bad5500c5af128c89bf5699b28f9a3ed52d60996a685c' 
  AND token = 'iMPvlJx2BmwZ7w4+a+p5lyVTKCYQpIkABK7DFQsaz8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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