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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f201bb67a15908a39fdf6d778e84a153670c8e3fabcee7a75bb7ead14adb3ba' 
  AND token = 'sK5e9EKOi5Ocg17sF10f71fOWz+QIKouqKSYPy3H4m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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