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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abf24a8344f48f8543b963c0c861b5f07ece5a5c9d9f9ef7260db2b4a81520a' 
  AND token = '4u9MZBvXol546PieJRkWE1TDuDl88FeS7q2FRGvAj6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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