SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d45ee4c11b8f812476265c4a9106ab5160a6b9378fb19eb40676bd4240b9ca0' 
  AND token = 'BHAF3/Lw/WYoOp0EImqDuJthf9815ulj2WKKVLioM8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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