SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce324f9b988287c9415f7663210ac51425fb4d86e0912bcf4b9585c8bfeeea5' 
  AND token = 'bfQXsamiQzYADb5j+8TjSKS7m+KYwu/md+HGMJXFeGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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