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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384b588a5ccc6d04a447424880e12b30113e744a98bd6afaae9945d1a74d54e2' 
  AND token = 'A6mHxc1oV8EHIfZTBt9fMCwgfkacUt4zY8udd44zXg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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