SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769e527f42f5cc8b38133770e150f36cd719f092d2db820b02412a24f1f8f1d7' 
  AND token = 'jX/w5kaKlV10BdOqnfVgbgEFFin/vEs+yAN/6yvCUjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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