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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc80b22cc8b5b9dfcc79b459c7c6f57573830abe77f91589e461b49b7d2a56c' 
  AND token = 'IZ169cTaam6CJfM2jln7qZMjh/9TtU8Rizch322Bxjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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