SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9020677ddc1cdec5b7a8786eff723087116ace41cb4b1f392d2050d1f15dd4bc' 
  AND token = 'YgxY+srFiKzl1PMmnqElObhbhNnAU3Jqx9mzfJyZBUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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