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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8279d6590af55c6e436229d6dea6fc157cbda97fb389670e4b7f72eaacc972f4' 
  AND token = 'uJ/lwve5c8kVT1KRjUFtd7AFoM3Ee9AHn6nzkwVdFPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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