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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce7bf955dc4b0280a10c32380f32b9a99670c7b1d303f43d4c339cecca5e224' 
  AND token = 'ye1aWUCgrpEuTxszv/g7Mih3xPx3BkJTPywl6cLmYG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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