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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94c0fc1e858fcdd361a6bc44754200ba34aadf901e79db912ded3b65cc1cb81' 
  AND token = 'moBqKI4bSN/XRVoUM5YUzsymeA2S61zWFIjWSV7jYFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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