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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a6702bf64128b7de4b51c0524e7e5a3197ee749056f3918805cd0f13c4a9d8' 
  AND token = 'AEdw5SGigiFqPjp5h9FtAcewkwYiHgJ8S8G9wRS6b6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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