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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e07b1862115c85ac696d2d963e54751fc6f4a821c1a83a854e85617bc636c5' 
  AND token = 'QJOe7XewZJpCmk/6mS0gqPzZbTN0E4tgAsVLfwv1IOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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