SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ace2ea064184f0e82caf2b427d2a68862a18b9ac7332c80aac9fc0f7dc05906' 
  AND token = 'rPY6JKBZsEqVMzHg/jryeBVXg9p/DMgX+pa6jdWzCsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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