Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc11afe660b8604383588e1338076b5f95029b8aa656761badcaaf75cc50ef5d' 
  AND token = 'rwtVKq8AflPFYXYdl9MLni6TSMglcESDCLVaK2/pvwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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