Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbb54b23b70779220bcb80f94497d0745b0e06aff2c9459e458f5a8736e7426' 
  AND token = 'j/oMklCZC/FiFh9z0TaOC9+b/17kSYKPuMpFj3tqTjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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