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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064436f144b49c3d2f0834629cc1b5c9fe7b9331fbf068698b4b8ad4918360c2' 
  AND token = 'vpnoCDGruuQGzfqs3jK2He3d3eGazO/NIWXHuvh5ubY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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