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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d3fdc98218f1105cc0d48e6c1a339b395e86d851da26b94f79e19b353b21b6' 
  AND token = 'Fr1ZhuTba5rm8AbqEc5EzwK5W/V5pxk9+Gk5j0I9iMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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