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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61032994a523708dbc29db03d3c516028d344e72b65ea5fba516a6646442fb70' 
  AND token = 'sbIDSQ4ovi8YUHicT+z4HBcDfLK1r2AXHMlOxGFGC7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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