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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79077eb99052954d100815b9164326aefcb200fcee0e72fb43e37485b5e717f' 
  AND token = 'uggBWRGVXrdA69GlNul6+t9q4N0qCfuvkXu+S9hBgc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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