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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2f4b5877e058571ad65cc5cad949397e5a91b4185b7aead6d173a24951e770' 
  AND token = 'GtMEGbVU8Ulb/rI5VK9saExjRWsCOA+GtqdIoc4A0II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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