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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51217a9cc27cbbd57e6434e91df4898add70515f2f61fcabdd83076f2c780913' 
  AND token = '6mF5Fy34TGpmKJNjRj2le4UEVAPm+C2gM5n25SWkWQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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