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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2957c2a9a9e0634c113df7710605f4e9b5c91a61855b65e9c63a30e4a9bb18ab' 
  AND token = 'xmFBIhkbgUe4yz0RJ4oAFLdD64LLekI0W4cE8RNZl8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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