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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76412bb2358c070e77f73cacdb57eb1af228ef24a70715300f5678fe6658664e' 
  AND token = '4LfgHxLimZiU6NFUU6pZQb08AMLVTDc3zw/4tiui5Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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