SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3726a7783633a89fa875a1446fc759d181edee1eca3d0aeb8857dd89e7cecd' 
  AND token = '/hQiaYQMfR4u0K/0FwZAPjb7fVCUzkl6+pclLJ4zGCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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