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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b63fc2343962fe69d18f3ea8f1ec5c2bb6924fffb05ee8893586d5865bc4c88' 
  AND token = 'j7Y/mlNXKSSp+myOo9tg54TWOF/8XjeJGf8pKmF/owU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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