SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416ca604b1b6d8adf7a635f8291c6499cd16b8babd3ba8307dfe525e93226e2f' 
  AND token = 'PGvutgITETjY4nGkfoNNrc3SBNU128u2RJZ1F97wvqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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