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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699bfbe5f39ee4a05ca4bb6456382baef8f0657058756d5292386b8cd27fc4fc' 
  AND token = '4EdcVQvS8COP/xgHloogFP/Upw8y+yLTYR71WhRIf2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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