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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39390c595dffef6ecaa0bd3c4bb72500ca6199b343a74dc3e3db48266ead96eb' 
  AND token = '9MMxEkwb9ZQ4w0DWArcE8SNvtmeb5AYpI6qYgU9CXkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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