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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516031e0584a33c48a4dff5adeec4ace5bc8b7ae9a908f17199b43bd6222dcbc' 
  AND token = '+zCx8/eQc2w+uAPby4UPUjXhIIM8SpYd6dE9OX4ZyXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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