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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e37ca45684824f95db50776b49d3a1f98525e5dd99f162b6952bc86229c87e0' 
  AND token = '/De+suP8Upnty+qfHrTyZnpPEUnNH1nUZ2XpXWKwI68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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