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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0babd6a167f4bfe9e0a55e30d0988607a43210fea071b8a329f8604281056d63' 
  AND token = 'qDZnQhLqkKctt6gzv+QNzSbhrv8Af8ZpbkbOqSJ+J1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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