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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c66c6f71bc17058b70850b1d60f29e9289f78017ccffce17f87c7c481433de' 
  AND token = 'ePcD5WyV3CArvq9gcfa0OqPa8mDptGHGOoU1mEyPpSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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