SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd4f8f5a54ba4f436d0bc04206b2bac21bf7d730bc0e6de9c0cbff1e29b99a8' 
  AND token = 'h8aJ1YtMwBkWZXZtLGZjOQHfaNIvhsA1KvBIQ3l7bVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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