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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430559f82ee3c97f8cccc53684830cba5adf265edfa6ec438d9ac00ebbf9f3da' 
  AND token = 'B0/ESS8S0bIdhr/eCdC6pUn/UMeM5z4g83wzTX6YLYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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