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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f35f6acddbf53d81a78c0a40bc1ccbeb7b6cc1e29ddf0d532bb85001f9e7bd' 
  AND token = '1Q2syqpUbJFvBi3/YiIw0YLqpjlu0mPy4pHp71y/zfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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