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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb96f66e570f9c4d0f368a6cf2b4b00b824cd3d60ae8f5822e4caf1e73d7e216' 
  AND token = 'hexXGb5U7dIL06llxJ8VBM+jsWXkOjRVY/fqYTo6+TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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