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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1caf5f6bda7ee517d160bf402ea83963ad439211a05501eea9e4fe653a7233ec' 
  AND token = 'ZbrDnK1+B/OCBA08jAYhB59p1v6Za4QJaaB4UAJSnog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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