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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5d529f245ad574553e1d29451ff0f1da4a3ae07ca8fdaca18caf8d5d6a29e7' 
  AND token = 'Gx7I62aDwjtKKxoauHBwxEfc922usC81ACWkD7mrw0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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