SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f25de35268cc44dbb6661b2e2d899daf051f92e369f178a4d641d0e47962e57' 
  AND token = '0mGnujY6Ex9AzDfgg3NdP+UfbE8NUTRxhHV2vgijZXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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