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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016cb07da89f474f8d041210062aba80a7b875acb7c3e40342cf1a24cb782665' 
  AND token = '0a1K84ypkSAEuYomgYkCsca3UvD2O/4U433fgztLTsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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