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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f47034bfef9e12682e6a86117e6efcc6ac7f6413138a6135f0064189b7045e' 
  AND token = '4I8A3vk03/0d5XBun9Tur1ZNtE/43MMDRUQo5ucilCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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