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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07787f8f180054791747c17ffbc768bc81a9046afe5e3bf159a7924dc84181d9' 
  AND token = 'giSLJEDinfwY6WGs2GsnWbvak0AProsdfJ2X8Sv+DCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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