SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb537b8048d6d134f2a6a7e64c8173a9b6cd47406251f1369dbc1edd46d17023' 
  AND token = 'bujqdy4jgJiFDTqIuYaHm+hL70/+eUM+8wZNnp122wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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