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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ed44ca4d60d66d118b161c49ce55b8d92c11bb960abfca96bba85a20394116' 
  AND token = '9HDQJZf2qAyQrcf/NlWi3h/SVWoEPp9Lkj+O8FRg0HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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