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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c795509a2a91a27c1ee96fcaa634bec72be7263f3d8c414a16af6c66b454ee' 
  AND token = 'jdb7EKdzDIAwi39zla5Re/IhUy54RsGJLcHj6Ceoijk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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