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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1326103a931c16a3f233fcba365b0ced829bb2dac7d11de4f13d7a511d8e183' 
  AND token = 'fl+afloRkOas25TQAV7D3rHtWshMJhvjaZ0N6amUKOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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