SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fb87b3d8a8005ebdd4d8fc606654348e245708d8f117e8aeca5650f64bed0d' 
  AND token = 'd1p5bml0uSo53yH6qSIUD+Tirc8npC1iX6wAGzNyzUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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