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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff1b9272ea92d5ccb1b21ada08bafcd3b54a584e42a5225e75ece52374d0457' 
  AND token = 'qmmtt5zHZBZMcPhI/8jXD5jHrQSoa0H/sbR74PXD0rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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