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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b50ff9efc5e92e97d9573e7f49f2633a943965308d3fe02f2f7b6128ce34974' 
  AND token = '0YugpBtSsXtRQbLVnLB7IHNeqvzvQGkgO6kE9hUz4YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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