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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eabf47048f182d59a9032d861c3002fb89a23144a671cd37754737265dc45ba' 
  AND token = '69QH8BZxg84fwNlZiAOHyJGcK5W5le8KMwIXnxY9MmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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