SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e1abaa4d283c9009328b3272478b07df8dd6d01f9a6ba03b54a6112c6c9f95' 
  AND token = 'wh/tYQHPjndlJvmbq2BLpor343dq1FClas9k8J9P5TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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