SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a965082bdfcdc9cfe7b897ac0e221508aa13189b5453dc46c40c1bc88f470fc' 
  AND token = 'sqYg1on/HViBD+XZxVjK/HzTm4UDk6AUVrkhEQgnasE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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