SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6cdbee863a8e53d39dd765bd9c88a42ab3c917a2fe00a157647b4fca9f6138' 
  AND token = 'UsyGIIgAMjzJJvly27vt9jDnfXnNpvdvZq4fMxihiK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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