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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac76c89bcf24b6bdaa7ea5f56f63d5b05d672e1e77110314bc2138e61901cc8' 
  AND token = 'Z046twy/D3vnPn/RrDORvv3G5cTz77PZ1Qnk+7ui1tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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