SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626a4a01dc05ece2e9f8be492d01682888f485402c72226a3777c5968ba4bbfe' 
  AND token = 'Y7NJAQ3iHAg+FY4BGQmFnMq5CgxooPlIrXRTh1RBZdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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