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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8ce824f079e9ea66e5f3bd8e5307acb70abd62431cf14e85fc8e18d9329744' 
  AND token = '/eICE6ogqeNF1ppKc2sIiRauUQMeymJE8o6K8YS1K8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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