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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fa1d6d169da08669f02e61cc4feaccb24d5c51577120b048e1dacad30fb62b' 
  AND token = 'E/wy3D+gH4bw3xJZTE/u/Xu7K/0oyEZP1yHHGmth1hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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