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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd839644174eb39c5e684b1b53fddac59ed0f59a1ad4986ab0deedec778e4fd9d' 
  AND token = '6mgzjQ9IJC7kSkgkhGiL3xRNgVP7ow/fIk6SZbcwejs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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